\(\sqrt{125}-2\sqrt{20}-3\sqrt{80}+4\sqrt{25}\)
\(=5\sqrt{5}-4\sqrt{5}-12\sqrt{5}+20\)
\(=20-11\sqrt{5}\)
~ ~ ~ ~ ~
\(\sqrt{8x}-\sqrt{18x}+2\sqrt{32x}=14\)
\(\Leftrightarrow\sqrt{x}\left(2\sqrt{2}-3\sqrt{2}+8\sqrt{2}\right)=14\)
\(\Leftrightarrow\sqrt{x}\times7\sqrt{2}=14\)
\(\Leftrightarrow98x=196\)
\(\Leftrightarrow x=2\) (nhận)
Gpt :
1) \(\sqrt{x-1}+\sqrt{4x-4}-\sqrt{25x-25}+2=0\)
2) \(\sqrt{16x+16}-\sqrt{9x+9}+\sqrt{4x+s}+\sqrt{x+1}=16\)
3)\(\sqrt{4x+20}+\sqrt{x+5}-\frac{1}{3}\sqrt{9x+45}=4\)
4) \(\frac{1}{3}\sqrt{2x}-\sqrt{8x}+\sqrt{18x}-10=2\)
Giải các phương trình sau:
a.\(3\sqrt{18x}-5\sqrt{8x}+4\sqrt{50x}=38\)
b.\(3\sqrt{12x}-2\sqrt{27x}+4\sqrt{3x}=8\)
c.\(\sqrt{4x-20}+\sqrt{x-5}-\dfrac{1}{3}\sqrt{9x-45}=4\)
1) Tìm x biết
a) \(\sqrt{4x-20}+\sqrt{x-5}-\frac{1}{3}=\sqrt{9x-45}=4\)
b) \(\sqrt{16x-32x}-\sqrt{12x}=\sqrt{3x}+\sqrt{9-18x}\)
c) \(\sqrt{4x-20}-3\sqrt{\frac{x-5}{9}}=\sqrt{1-x}\)
Bài 1:Tìm x biết
1.\(\frac{2}{3}\sqrt{12x}+\sqrt{12x}-9=\frac{1}{3}\sqrt{3x}\)
2.\(\sqrt{2x}-3\sqrt{8x}+4\sqrt{18x}=14\)
Tìm x biết:
a.\(\sqrt{18x}+2\sqrt{8x}-3\sqrt{2x}=12\)
b.\(\sqrt{9x+18}+2\sqrt{36x+72}-\sqrt{4x+8}=26\)
c.\(\sqrt{\left(x-2\right)^2}=10\)
d.\(\sqrt{9x^2-6x+1}=15\)
e.\(\sqrt{3x+4}=3x-8\)
Bài 2:Giải phương trình
a,\(\sqrt{8x-4}-2\sqrt{18x-9}+2\sqrt{32x-16}=12\)
b.\(\sqrt{x^2-6x+9}=2x-1\)
Giải phương trình
a,\(\sqrt{4x^2+20x+25}+\sqrt{x^2-8x+16}=\sqrt{x^2+18x+81}\)
b, \(\sqrt{x^4+2x^2+1}=\sqrt{x^2+10x+25}-10x-22\)
c, \(\sqrt{x+8+2\sqrt{x+7}}+\sqrt{x+8-2\sqrt{x+7}}=4\)
1) Thực hiện phép tính
\(\sqrt{50}-3\sqrt{8}+\sqrt{32}\)
2) Giải các phương trình sau:
a)\(\sqrt{x^2-4x+4}=1\)
b)\(\sqrt{x^2-3x}-\sqrt{x-3}=0\)
Bài 1:Thực hiện phép tính
1.(\(\sqrt{28}_{ }-\sqrt{12}-\sqrt{7}\))\(\sqrt{7}\)+2\(\sqrt{21}\)
2. 2\(\sqrt{3}\) +\(\sqrt{27}\)-3\(\sqrt{45}\) +\(\sqrt{5}\)
3.(2\(\sqrt{2}\) -\(\sqrt{5}\)+\(\sqrt{18}\)).\(\sqrt{5}+20\sqrt{\frac{1}{10}}\)
4.\(\sqrt{27}-3\sqrt{48}+2\sqrt{75}-\sqrt{\left(2-\sqrt{3}\right)^2}\)
5.(\(\sqrt{8}-5\sqrt{2}+\sqrt{20}\)).\(\sqrt{5}\)+(40\(\sqrt{\frac{1}{10}}-10\)
6. \(\sqrt{2x}-3\sqrt{8x}+4\sqrt{18x}=14\)